OS4K — reception at SO8OO

Signals decoded by SO8OO in southeastern Poland. FT8 and CW have separate histories; all times are UTC.

FT8 activity

DXCC entity inferred from callsign: Belgium Most frequent locator attributed to this token: JO21

Receiver-side FT8 activity involving OS4K, decoded by SO8OO in southeastern Poland. 7,344 FT8 messages attributed to this token as transmitter, on 60m, 40m, 20m, across 109 UTC dates in the available aggregate history. Observed between 2026-06-06 and 2026-10-22.

These are automated observations at the SO8OO receiver, not an official contact log. Times are UTC. Attribution follows decoded FT8 message structure: CQ uses the first token and directed-looking messages use the second. Free text that resembles a directed message can be attributed imperfectly. Summary S/N reflects propagation plus SO8OO receiver, antenna and local-noise conditions. Counts are not adjusted for monitoring outages; transmissions that were not decoded are absent. Inferred entity and location data may be inaccurate for portable, remote or special-event operation.

SO8OO decoded 7,344 FT8 messages attributed to OS4K as the transmitting token by decoded message structure across 109 UTC dates in the available aggregate history. The largest monitored-band total was 40 m (53%), followed by 20 m (40%) and 60 m (8%). The busiest six-hour window was 19:00-01:00 UTC, containing 43% of decodes. Received S/N was mixed across SO8OO's weak, moderate and strong ranges; the estimated median was -14 dB.

Overview

7,344

Messages attributed

109

UTC dates decoded

1,245

Active 15-min windows

-14 dB

Estimated median S/N

Bands

60m · 554 40m · 3,860 20m · 2,930

First attributed message: 2026-06-06
Last attributed message: 2026-10-22 02:51 UTC

Observed FT8 message patterns

Attributed sample: 7,344 messages
Active dates: 109 UTC dates
Estimated median S/N: -14 dB
Estimated 10th-90th percentile: -23 to 0 dB
Recurring-pattern threshold: Met

SO8OO display ranges among successful decodes: weak (≤ -16 dB) 3,223, moderate (-15 to -9 dB) 2,300, strong (≥ -8 dB) 1,821.

WSJT-X defines S/N reports against a 2,500 Hz reference noise bandwidth. The ranges above are SO8OO receiver-side display categories, not official WSJT-X classes, transmitter-power measurements or estimates of how easy the station is to hear elsewhere. Statistics include only successful decodes on SO8OO's monitored FT8 channels; transmissions that were not decoded are absent.

Frequent counterpart tokens observed at SO8OO

Tokens most often paired with OS4K in decoded directed-looking exchanges:

DL6MRM · Fed. Rep. of Germany ×3 9A2L · Croatia ×2 9A6NTK · Croatia ×2 DG7RBV · Fed. Rep. of Germany ×2 DK2MAX · Fed. Rep. of Germany ×2 DK7MI · Fed. Rep. of Germany ×2 EB7FSB · Spain ×2 IS0KNY · Sardinia ×2 IW1GB · Italy ×2 R6OIW · European Russia ×2 SP1BMK · Poland ×2 SP2LPI · Poland ×2

Attributed messages by UTC hour

Rolling 90-day UTC chart window. Counts follow decoded message structure: the first token for CQ, or the second token in a directed-looking message.

Most frequent locator attributed to OS4K

The map compares the centres and boundaries of the locator field attributed to this token by decoded message structure, 2° × 1° as a Maidenhead square, and SO8OO's six-character receiver square. The separation is not an exact antenna-to-antenna distance or a radio-path length.

Attributed locator: JO21 · 5 decoded messages
SO8OO receiver locator: KN09VW
Locator-centre separation: 1,192 km (approx.)
Last such locator decoded: 2026-09-10 20:37 UTC

A decoded locator can describe portable, remote or special-event operation and is not proof of a permanent station address or transmitter identity.

Observed FT8 exchanges

S/N cells show: decoded at SO8OO / report transmitted by the counterpart. An observed exchange is not a QSL or an official logbook confirmation.

Time UTC	Band	OS4K S/N	Counterpart	Counterpart S/N	Msgs	Capture
10-22 05:39	60m	- / -3	OV9A	0 / -	2	Partial capture
10-22 02:50	60m	-20 / -	KT4ZX	- / +3	2	Partial capture
10-22 02:40	60m	-21 / -	KB2KBC	- / +3	3	Partial capture
10-22 02:38	60m	-23 / -	SP1IWC	- / -6	3	Partial capture
10-22 02:16	60m	-22 / -	VE3EY	- / +5	2	Partial capture
10-22 01:55	60m	-22 / -	WA4MB	- / -12	2	Partial capture
10-22 01:47	60m	-20 / -	S57M	- / -7	2	Partial capture
10-22 01:02	60m	-16 / -	N3CXV	- / -16	2	Partial capture
10-22 00:58	60m	-18 / -	N5MTJ	- / -16	2	Partial capture
10-22 00:49	60m	-19 / -	ON4TH	- / +2	3	Partial capture
10-22 00:45	60m	-18 / -	W3BL	- / 0	3	Partial capture
10-22 00:42	60m	-15 / -	M0ODP	- / -16	3	Partial capture
10-22 00:33	60m	-21 / -	DL1CF	- / +4	2	✓ Closing fragment
10-22 00:30	60m	-22 / -	EA4ETU	- / +1	3	✓ Closing fragment
10-22 00:28	60m	-24 / -	UK8FF	- / -10	4	Partial capture
10-22 00:25	60m	-22 / -	KB8OTK	- / -15	3	Partial capture
10-22 00:18	60m	-23 / -	PY5HOT	- / -15	3	Partial capture
10-22 00:16	60m	-19 / -	VE3ELL	- / -13	4	Partial capture
10-21 23:51	60m	-20 / -	ON6WDL	- / -13	4	Partial capture
10-21 23:47	60m	-21 / -	DB3EH	- / -3	4	Partial capture
10-21 22:22	60m	-24 / -	UD6AWH	- / -4	2	Partial capture
10-21 22:20	60m	-24 / -	EA7GCF	- / -1	3	Partial capture
10-21 21:22	60m	- / -10	9A7BB	-5 / -	3	✓ Closing fragment
10-21 21:16	60m	- / -20	GI8RPM	0 / -	2	✓ Closing fragment
10-21 08:42	40m	- / -7	F6DAY	-15 / -	3	✓ Closing fragment
10-21 08:18	40m	- / -18	YL3ASK	-12 / -	2	Partial capture
10-21 00:09	40m	-19 / -	W9DDK	- / 0	2	Partial capture
10-21 00:08	40m	-19 / -	W1RPQ	- / -11	2	Partial capture
10-21 00:04	40m	-16 / -	BG0FQU	- / -9	2	Partial capture
10-21 00:02	40m	-7 / -	A61DD	- / -1	2	Partial capture
10-20 23:12	40m	-17 / -	IZ8JFA	- / 0	2	Partial capture
10-20 23:10	40m	-17 / -	N1ECP	- / -8	3	Partial capture
10-20 23:08	40m	-16 / -	K3YQA	- / -9	2	Partial capture
10-20 23:06	40m	- / -14	SV8OVJ	+4 / -	2	✓ Closing fragment
10-20 23:03	40m	-20 / -	RW0AE	- / -12	2	Partial capture
10-20 22:59	40m	-17 / -	R9LY/P	- / -	2	Partial capture
10-20 22:54	40m	-19 / -	BG0FQU	- / -8	4	Partial capture
10-20 22:52	40m	-16 / -	R3DCA	- / -6	4	Partial capture
10-20 22:50	40m	-19 / -	PI7Q	- / +3	3	Partial capture
10-20 22:48	40m	-20 / -	UD6AWH	- / -3	4	Partial capture
10-20 22:47	40m	-17 / -	WB1BUZ	- / -7	2	Partial capture
10-20 22:44	40m	-20 / -	VU2RPS	- / -11	3	Partial capture
10-20 22:36	40m	-21 / -	IU7VOD	- / +6	3	Partial capture
10-20 22:34	40m	-20 / -	VE2FXR	- / -4	2	Partial capture
10-20 22:33	40m	-17 / -18	IU8LMC	-18 / -12	4	✓ Full exchange observed
10-20 22:30	40m	-14 / -	EA5ADT	- / -1	3	Partial capture
10-20 22:27	40m	-19 / -	IU7KEG	- / +7	2	Partial capture
10-20 22:24	40m	-9 / -	VE2FXR	- / -4	2	Partial capture
10-20 22:05	40m	-21 / -	EA8CA	- / +5	3	Partial capture
10-20 22:03	40m	-16 / -	BY1QH	- / -11	4	Partial capture

Recent FT8 messages decoded at SO8OO

Frequency values are decoder audio offsets in hertz, not RF frequencies.

60m

UTC    dB Audio  Message
022000 -20 1877  KE2IIG OS4K -16
022330 -19 1877  N7NR OS4K +02
023830 -24 1877  SP1IWC OS4K -06 (x3)
024030 -20 1877  KB2KBC OS4K +03 (x3)
024600 -23 1877  EA6EJ OS4K -01
025000 -19 1877  KT4ZX OS4K +03 (x2)
025130 -13 1877  N8LE OS4K -16
053930  -1  533  OS4K OV9A R-03 (x2)
054930 -11  982  OS4K IK3FHW R-11

40m

UTC    dB Audio  Message
000245 -10 1931  A61DD OS4K -01
000415 -16 1931  BG0FQU OS4K -09 (x2)
000515 -13 1931  KP4MAQ OS4K -08
000800 -20 1931  W1RPQ OS4K -11 (x2)
000915 -20 1931  W9DDK OS4K +00 (x2)
080800 -16 1694  OS4K F8CDM 73
081745 -14  688  OS4K SP3MSM R-13
081830 -13  636  OS4K YL3ASK R-18 (x2)
084200 -14 2139  OS4K F6DAY R-07 (x3)

20m

UTC    dB Audio  Message
190845  +1 1660  CT1FIU OS4K +11 (x3)
191015  +4 1659  IK0WCL OS4K +14 (x5)
191245  +6 1659  SA5UTR OS4K -14 (x3)
191415  +2 1659  EC5CFV OS4K +01 (x2)
192145  -9 1659  VE2CXA OS4K -02
120845 -17  906  OS4K PA2MD 73

Decoder S/N history by band

Count-weighted daily averages across messages attributed to this profiled token and successfully decoded at SO8OO, limited to the rolling 90-day UTC chart window.

CW

No CW receptions recorded for this callsign in the last 30 days.

Explore CW reception at SO8OO

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